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Herbicide-Insecticide Combinations
Grasshoppers are starting to hatch and likely will be a serious problem again this season. The early hatch this year means that grasshopper treatment time may coincide with post-emergence herbicide treatment time. Thus, there may be a lot of interest in tank-mixing grasshopper control insecticides with herbicides.
Tank-mixes eliminate a trip over the field, but also may have some disadvantages. Potential problems that need to be considered before applying a tank-mixture include:
1. Timing of both pesticides at recommended treatment stage.
2. Physical compatibility.
3. Possible antagonism and reduced efficacy.
4. Possible synergism and crop injury.
Information on insecticide-herbicide combinations is often limited. Physical compatibility can be checked using a quart jar compatibility test (refer to circular W-253 "1989 Agricultural Weed Control Guide") prior to adding the materials to the spray tank. However, the only way to evaluate the efficacy and injury potential of a tank-mixture is to try it on a small area before treating a large acreage. Treating a large acreage with no information or experience using a particular tank-mixture could be a costly mistake.
The following herbicide-insecticide combinations may increase crop injury.
Organophosphates or Carbamates* + Harmony, Glean, or Ally
(Small Grains)
(Malathion, (Sevin, Pinnacle (Soybeans)
Lorsban, Furadan) Stampede CM (Small Grains)
Parathion, Betamix or Betanex (Sugarbeets)
Diazinon, or Basagran (Soybeans, Dry Beans)
Cygon)
* Not all combinations may increase injury, but different pesticides in the same class often respond the same. Malathion especially seems to increase injury with these herbicides.
Certain herbicides are antagonized by other chemicals, resulting in reduced weed control. Again, information on insecticide-herbicide antagonism is limited. However, Carbyne, Hoelon, Poast, Fusilade, Assure, Whip, Assert, and Tiller herbicides are antagonized by many other types of chemicals and potentially could be antagonized by insecticides.
Physical compatibility. The following insecticide-herbicide combinations are physically compatible with continuous agitation, based on jar tests conducted several years ago. Keep in mind that crop injury or poor weed control could still result from these combinations.
Sevin XLR Plus -2,4-D amine, 2,4-D ester, MCPA amine, MCPA ester, Hoelon, Banvel, Glean, Banvel + MCPA, Bronate, Buctril, Betamix, and poast.
Sevin WP - 2,4-D amine, MCPA amine, MCPA ester, Hoelon, Banvel, Glean, Banvel + MCPA, Bronate, Roundup, Buctril.
Furadan - 2,4-D amine, 2,4-D ester, MCPA amine, Glean, Banvel.
Malathion - MCPA amine, MCPA ester, 2,4-D amine, 2,4-D ester.
Orthene - 2,4-D amine, 2, 4-ester.
Pydrin - 2,4-D amine, 2,4-D ester, Banvel, Roundup, Buctril.
Lorsban - Betamix, Betanex, Poast.
The following combinations appeared to have compatibility problems:
Furadan - MCPA ester, Hoelon, Roundup.
Sevin WP - 2,4-D ester.
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